Our daughter liked Art Supplies and kits when she was a little girl and she and my wife spent many hours making "creations" that decorated our bulkheads (some still do), overhead and trip logs (verses Deck Log which is entirely ship's business oriented). Somewhat older, the kids liked model kits. See Hobbymasters - Ship Wood Models as an example.

Kid's books can be fun, particularly if you do a family "story hour" in the evening--an hour when everyone gathers and shares the reading of a book, each reading aloud for a while, with appropriate voices for each character. (A far preferable pass-time than watching a movie in my view.)

FWIW...

__________________"It is not so much for its beauty that the sea makes a claim upon men's hearts, as for that subtle something, that quality of air, that emanation from the waves, that so wonderfully renews a weary spirit."